👉 Subaquatic refers to a region of the ocean, typically found in deeper water than surface waters. This term encompasses the areas below 3,000 meters (10,000 feet) deep and extends into the abyssal zone, which is the deepest part of the ocean. Subaquatic ecosystems are characterized by diverse species of marine organisms ranging from microscopic plankton to large fish and coral. They play a crucial role in maintaining the overall health and stability of marine ecosystems,